Sludge contaminants

Sludge contaminants include many hazarous chemicals that are found in sewage sludge. Hundreds of communities across the U.S. sell toxic sludge products that are typically renamed biosolids and sold or given away as "organic fertlizer" or "organic compost." A list of some chemicals and pathogens found in sludge is below. Click on this link to view Scientific Studies of Sewage Sludge.

Targeted National Sewage Sludge Survey 2009 EPA study
The EPA's 2009 Targeted National Sewage Sludge Survey concluded that all sewage sludge contains toxic and hazardous materials, including large numbers of endocrine disruptors. The Targeted National Sewage Sludge Survey results are described in two EPA reports published in 2009. EPA found that dozens of hazardous materials, not regulated and not required to be tested for, have been documented in each and every one of the sludge samples EPA took around the USA. Hundreds of communities across the U.S. sell sludge products that are renamed biosolids and sold or given away as "organic fertilizer."

Survey Results
The survey found:


 * The four anions were found in every sample.
 * 27 metals were found in virtually every sample, with one metal (antimony) found in no less than 72 samples.
 * Of the six semivolatile organics and polycyclic aromatic hydrocarbons, four were found in at least 72 samples, one was found in 63 samples, and one was found in 39 samples.
 * Of the 72 pharmaceuticals, three (i.e., cyprofloxacin, diphenhydramine, and triclocarban) were found in all 84 samples and nine were found in at least 80 of the samples. However, 15 pharmaceuticals were not found in any sample and 29 were found in fewer than three samples.
 * Of the 25 steroids and hormones, three steroids (i.e., campesterol, cholestanol, and coprostanol) were found in all 84 samples and six steroids were found in at least 80 of the samples. One hormone (i.e., 17a-ethynyl estradiol) was not found in any sample and five hormones were found in fewer than six samples.
 * All of the flame retardants except one (BDE-138) were essentially found in every sample; BDE-138 was found in 54 out of 84 samples.

Alkylphenols and Alkylphenol Ethoxylates
Alkylphenols:
 * Nonylphenols
 * Octylphenol

Alkylphenol ethoxylates (APEs):
 * Nonylphenol ethoxylates (NPEs)

Dioxins and Furans
Dioxins and Furans

Flame Retardants
Flame Retardants:
 * Polybrominated diphenyl ethers (PBDEs)

Metals and Non-Metallic Elements
Metals and non-metallic elements:
 * aluminum
 * antimony
 * arsenic
 * barium
 * beryllium
 * boron
 * cadmium
 * calcium
 * chromium
 * cobalt
 * copper
 * iron
 * lead
 * magnesium
 * manganese
 * mercury
 * molybdenum
 * nickel
 * phosphorus
 * selenium
 * silver (including nanosilver, nanoparticle of silver, an antimicrobial agent)
 * sodium
 * thallium
 * tin
 * titanium
 * vanadium
 * yttrium
 * zinc

Pesticides
Organochlorine Pesticides:
 * Aldrin
 * DDE
 * DDT (1,1,1-trichloro-2, 2-bis (4-chlorophenyl) ethane)
 * Dieldrin
 * Heptachlor
 * Lindane

Other Pesticides:
 * 1,2-Dibromo-3-Chloropropane (DBCP)
 * Naphthalene
 * Permethrin

Perfluorinated Compounds
Perfluorinated compounds:
 * PFOA
 * PFOS

Pharmaceuticals and Their Breakdown Products
Analgesics (drugs that treat pain):
 * Codeine
 * Ibuprofen (Advil)
 * Naproxen (Aleve)

Antibiotics (drugs that kill bacteria):
 * Azithromycin (Zithromax)
 * Clarithromycin (Biaxin)
 * Ciprofloxacin (Cipro)
 * Doxycycline (Doryx, Monodox, Vibramycin)
 * Enrofloxacin (Baytril)
 * Erythromycin
 * Minocycline (Dynacin, Minocin, Myrac)
 * Norfloxacin (Noroxin)
 * Ofloxacin (Floxin)
 * Oxytetracycline (Terramycin)
 * Sulfamethoxazole and Trimethoprim (Bactrim)
 * Tetracycline (Achromycin)
 * Virginiamycin

Anticonvulsants (drugs that prevent seizures):
 * Carbamazepine (Tegretol)

Antidepressants (drugs that treat depression):
 * Fluoxetine (Prozac)

Antifungals (drugs that treat fungal infections):
 * Miconazole (Desenex, Lotrimin, Monistat)

Antihelmintics (drugs that treat parasite infections):
 * Thiabendazole

Antihistamines (drugs that treat allergy symptoms):
 * Diphenhydramine (Benadryl)

Calcium Channel Blockers (drugs that treat hypertension and angina):
 * Diltiazem (Cardizem)

Fibrates (drugs that treat hyperlipidemia):
 * Gemfibrozil (Lopid)

H2 Blockers (drugs that treat gastroesophageal reflux disease):
 * Cimetidine (Tagamet)
 * Ranitidine (Zantac)

Other Drugs:
 * Caffeine
 * Triclocarban (3,4,4'-trichlorocarbanilide)
 * Triclosan (and its breakdown products, such as 2,8-dichlorodibenzodioxin and Methyltriclosan)

Breakdown Products of Pharmaceuticals:
 * 4-Epianhydrotetracycline
 * 4-Epitetracycline
 * Anhydrotetracycline
 * Cotinine
 * Dehydronifedipine

Phthalates
Phthalates:
 * Diethylhexyl phthalate (DEHP)

Polycyclic Aromatic Hydrocarbons
Polycyclic aromatic hydrocarbons (PAHs):
 * Anthracene
 * Fluoranthene
 * Pyrene
 * Benzo(a)pyrene
 * 2-Methylnaphthalene

Other Chemicals and Pathogens
Other Chemicals and Pathogens:
 * Bisphenol A (BPA)
 * 1,4-Dichlorobenzene
 * Endotoxins
 * Isopropyltoluene
 * 2-methylnaphthalene
 * N-nitrosodimethylamine (NDMA)
 * Organohalogens
 * Para-cresol
 * Pathogenic microorganisms such as pathogenic bacteria, viruses, protozoa, and helminths
 * Phenol
 * Polybrominated biphenyls (PBBs)
 * Polychlorinated biphenyls (PCBs)
 * Polycyclic musks (such as Galaxolide and Tonalide)
 * Single-walled carbon nanotubes (SWNTs)
 * Steroids and hormones (such as stigmastanol, beta-sitosterol, and estradiol)
 * Trihalomethanes (THMs)
 * 1,2,4-Trimethylbenzene

Related SourceWatch articles

 * Scientific Studies of Sewage Sludge
 * Sewage sludge
 * Biosolids
 * Targeted National Sewage Sludge Survey

External articles

 * Rebecca Renner, Sludge Sloughs Off Perfluorinated Chemicals: Biosolids can leach perfluorinated chemicals into farm soil, albeit at low levels, Chemical and Engineering News, April 8, 2011.
 * John Heilprina, "15 Sewage Chemicals Could Face Regulation; Fertilizer Plea Ignored," Saint Paul Pioneer Press, January 1, 2004.